Why lxd ipvlan nic doesn't support hot plugging

wcjj · July 7, 2021, 8:29am

Does anyone know why lxd ipvlan nic device doesn’t support hot plugging

https://github.com/lxc/lxd/blob/5095c1af49b8b6d0df44381d0e93203d2acadf36/lxd/device/nic_ipvlan.go#L26

tomp · July 7, 2021, 8:33am

This is because at this current time LXD relies on the underlying ipvlan support in liblxc. And liblxc doesn’t support hotplugging/editing config while the container is running.

In principle LXD could be updated to use its own ipvlan implementation, and then pass the ipvlan interface as a physical NIC (like we do for bridged and p2p types).

github.com

lxc/lxd/blob/master/lxd/device/nic_ipvlan.go#L257-L264

    
      
          	nic := []deviceConfig.RunConfigItem{
          		{Key: "name", Value: d.config["name"]},
          		{Key: "type", Value: "ipvlan"},
          		{Key: "flags", Value: "up"},
          		{Key: "ipvlan.mode", Value: mode},
          		{Key: "ipvlan.isolation", Value: "bridge"},
          		{Key: "link", Value: parentName},
          	}

wcjj · July 7, 2021, 8:45am

Got it.
Thank you for the answer.